AD7492BRUZ referencing

Hi!

The AD7492 datasheet says that the internal 2.5 V reference is available for external referencing. The EVAL-AD7492SDZ User Guide showing the connection of REF OUT with +input of the AD8021AR what have typical Input Bias Current 7.5 uA.
I want to connect the voltage divider (750 kOhm+32 kOhm) to the output REF OUT of the AD7492BRUZ and join the midpoint of the divider with a non-inverting input of the AD8066. Could this load affect the AD7492BRUZ?

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  • 0
    •  Analog Employees 
    on May 8, 2017 12:41 AM

    Hi Regwer,

          

       The AD8021 in the AD7492 evaluation board is buffered to connect to external circuit and this will give enough current drive to  the external circuit. Do you mean putting a resistor a 75Kohm and 32Kohm between REFOUT and AD8021? Where is AD8066 connected? If you have a schematic to have a better understanding, please share.

     

    Regards,

    Jonathan

Reply
  • 0
    •  Analog Employees 
    on May 8, 2017 12:41 AM

    Hi Regwer,

          

       The AD8021 in the AD7492 evaluation board is buffered to connect to external circuit and this will give enough current drive to  the external circuit. Do you mean putting a resistor a 75Kohm and 32Kohm between REFOUT and AD8021? Where is AD8066 connected? If you have a schematic to have a better understanding, please share.

     

    Regards,

    Jonathan

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